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121.

Solidification time for riser should be

A.	less than that of the casting	B.	same as that for the casting
C.	more than that of the casting

122.

According to Chvorinov's equation, the solidification time of castings is

A.	directly proportional to the volume of the castings	B.	Directly proportional to square of the volume of the casting
C.	inversely proportional to square of the volume of the casting	D.	inversely proportional to the volume the casting

123.

The most efficient shape of a series is that which

A.	given a minimum heat loss	B.	keeps the metal in molten state for longer period
C.	both (A) and (B) above

124.

The method in which green sand is generally used is

A.	pit moulding	B.	plate moulding
C.	bench moulding	D.	none of the above

125.

The location of riser least depends on

A.	the metal to be cast	B.	the size of core
C.	design of casting	D.	feasibility of directional solidification

126.

A blind riser can be located

A.	in cope	B.	in drag
C.	in either cope or drag	D.	in cheek only

127.

Padding is

A.	a method for production of chilled castings	B.	an extra support for thin castings
C.	an extra metal added to the original uniform section of the casting	D.	none of the above

128.

The solidification shrinkage of magnesium alloys is about

A.	0.1 percent	B.	1 percent
C.	4 percent	D.	14 percent

129.

The solidification shrinkage of carbon steel is around

A.	0.1 to 0.2 percent	B.	0.5 to 1 percent
C.	2 to 4 percent	D.	8 to 10 percent

130.

Melting point of copper

A.	665?C	B.	1083?C
C.	1444?C	D.	1576?C